Preheat oven to 375°. Brush a 15x10x1-in. baking pan with some of the melted butter. Unroll phyllo dough; cut stack into a 10-1/2x9-in. rectangle. Discard scraps., Line bottom and sides of prepared pan with 2 sheets of phyllo dough (sheets will overlap slightly). Brush with butter and sprinkle with 1 tablespoon Parmesan cheese. Repeat layers 5 times. (Keep dough covered with a damp towel until ready to use to prevent it from drying out.) , Top with layers of remaining phyllo dough; brush with remaining butter. Sprinkle with mozzarella cheese; arrange onion and tomatoes over cheese. Sprinkle with oregano, thyme, salt, pepper and remaining Parmesan cheese. Bake until edges are golden brown, 20-25 minutes.